Submarine

Cable
 About Us

ZTT penetrated the optical fiber cable industry in the

year 1992 and grew to a public company in 2002.
With constant growth in global market share, ZTT
is now the largest cable manufacturer in China for
power and telecommunication. Zhongtian Technology
Submarine Cable Co., Ltd (ZTTSC) was established
in 1999, a 100% arm of Zhongtian Technology Co.,
Ltd. (ZTT)

ZTT's leadership is clearly marked through its

design development, manufacturing, marketing,
and distribution program for its "King of Cable"
family; submarine optic fiber cable, submarine
power cable, submarine composite cable and other
hybrid submarine cable for the energy, industrial and
communication for the energy and telecommunication
markets within China and globally.

ZTT places its top product quality stamp through

State-of-the-Art technology, certification and
acceptance. According to International Standards
and product trends, its R&D department pushes
on constantly in search of excellence in oceanic
requirement.

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Product Range

Fiber optic cables DC submarine power cable

Control cables DC submarine optical fiber composite power cable
Instrument cables Electric Submersible Pump cable(ESP)
AC submarine power cable Hybrid cable
AC submarine optical fiber composite Related accessories
power cable

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 Power cable Optical cable

Application

Offshore windfarms Islands connection

Tidal & wave energy farms Lake or river crossings
Offshore oil and gas industry

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Service

ZTT has a team of highly trained product specialist

for offshore jobs. Performing feasibility research,
cable laying supervision, cable splicing, establishing
terminal to its final project commissioning to complete
the entire submarine cable system.

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 Submarine Optic Fiber Cable

Submarine optic fiber cable is laid for data transmission between states,with the
performance of huge transmission capacity, long distance and compatibility to sever
ambience.

ZTT develop its own technic for manufacturing submarine optic fiber cable and has
proprietary wharf and scored many first in invention.

The first to receive National Certification for deep sea SOFC.

The first to be certified by UJ consortium in China.
The largest manufacturing factory of submarine optic fiber cable in China.

Applicable standards
ZTT's SOFC are designed, manufactured and tested according to the latest edition of the
following codes and standards:
National Standard GB/ T18480-2001
National Military Standard GJB4489-2002
ITU Recommendation for optical fiber submarine cable systems, ITU-T G971~978

Fiber unit design Drawing of Fiber unit

Fiber

Water-blocking jelly

Stainless steel tube

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Characteristics
High strength fiber – ensure stable signal transmission and effective operation life.

Special water blocking jelly – prevent the ingress of water or hydrogen gas.

On-line fiber excess control – exact fiber excess in finished cable

Stainless steel tube – avoid external damages to optic fiber.

Cable protection
The optical fiber submarine cable should provide protection against the
environmental hazards at its depth of utilization: protection against marine life, fish-
bite and abrasion, and armouring against aggression and ship activities. Different
types of protected cable are defined in [G.972], in particular:

The lightweight cable (LW cable);

Cable suitable for laying, recovery and operation, where no special protection is
required.

The lightweight protected cable (LWP cable).

Cable suitable for laying, recovery and operation, where special protection is
required.

The single armoured cable (SA cable).

Cable suitable for laying, burial, recovery and operation, and suitably protected for
specific area in shallow water.

The double armoured cable (DA cable).

Cable suitable for laying, burial, recovery and operation, and suitably protected for
specific area in shallow water.

The rock armoured cable (RA cable).

Cable suitable for laying, recovery and operation, and suitably protected for specific
area in shallow water.

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 Typical structure of SOFC(S17-for Repeater System)

Light weight
Model : SOFC-S17-LW

Stainless steel tube (with fibers)

Armouring wire

Copper conductor

Outer sheath

Light weight protection

Model : SOFC-S17-LWP

Stainless steel tube (with fibers)

Armouring wire

Copper tube

Insulation

Steel tape

Outer sheath

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 Single armor
Model : SOFC-S17-SA
Stainless steel tube (with fibers)

Armouring wire

Metallic seal (copper tube)

PE inner sheath

Armouring wire

Bitumen

Outer covering

Double armor
Model: SOFC-S17-DA
Stainless steel tube (with fibers)

Armouring wire

Metallic seal (copper tube)

PE inner sheath

Armouring wire

Bitumen

Outer covering

Technical parameter for SOFC (S17 Repeater system)

Unloaded
CBL NTTS NOTS NPTS Operational Storage
Type min.bending
(kN) (kN) (kN) (kN) temp(℃) temp(℃)
radius(m)

SOFC-S17-LW 80 55 32 20 0.5 -20～+50 -30～+60

SOFC-S17-LWP 80 55 32 20 0.5 -20～+50 -30～+60
SOFC-S17-SA 265 172 105 80 1.0 -20～+50 -30～+60
SOFC-S17-DA 540 350 220 135 1.2 -20～+50 -30～+60

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 Typical structure of SOFC (Q10-for Unrepeater System)

Light weight Light weight protection

Model : SOFC-Q10-LW Model : SOFC-Q10-LWP

Stainless steel tube

Stainless steel tube

Inner sheath (W/Cu) Inner sheath (W/Cu)

Armor layer
Armor layer
Bitumen(binder tape)

Innerr sheath (W/Cu)

Bitumen(binder tape)
Armor tape
Outer PE serving HDPE out serving

Single armor 1 Single armor 2

Model : SOFC-Q10-SA1 Model : SOFC-Q10-SA2

Stainless steel tube Stainless steel tube

Inner sheath (W/Cu) Inner sheath (W/Cu)

Armor bedding Armor bedding

Armor layer Armor layer

Bitumen Bitumen

Out PP-yarn serving Out PP-yarn serving

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 Double armor 1 Double armor 2
Model : SOFC-Q10-DA1 Model : SOFC-Q10-DA2
Stainless steel tube
Stainless steel tube
Inner sheath (W/Cu)
Inner sheath (W/Cu)
Armor bedding
1st armor layer
1st armor layer
2nd armor layer 2nd armor layer

Bitumen Bitumen

Out PP-yarn serving Out PP-yarn serving

Rock armor
Model : SOFC-Q10-RA
Stainless steel tube

Inner sheath (W/Cu)

Armor bedding

1st armor layer

2nd armor layer

Bitumen

Out PP-yarn serving

Technical parameter for SOFC ( Q10 Unrepeater system)

Unloaded
CBL NTTS NOTS NPTS Operational Storage
Type min.bending
(kN) (kN) (kN) (kN) temp(℃) temp(℃)
radius(m)

SOFC-Q10-LW 80 60 40 25 0.50 -20～+45 -30～+60

SOFC-Q10-LWP 80 60 40 25 0.70 -20～+45 -30～+60
SOFC-Q10-SA1 200 160 110 70 0.65 -20～+45 -30～+60
SOFC-Q10-SA2 280 200 150 120 0.85 -20～+45 -30～+60
SOFC-Q10-DA1 420 300 210 150 0.80 -20～+45 -30～+60
SOFC-Q10-DA2 650 400 280 200 1.00 -20～+45 -30～+60
SOFC-Q10-RA 400 200 120 100 1.00 -20～+45 -30～+60

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 Submarine Optic Fiber Composite Power Cable

Submarine power cable or submarine optic fiber composite power cable are widely used
in offshore wind generation farm, tide generation farm,or offshore oil & gas platforms.ZTT
owns complete production chain for producing submarine cable, together with own test
center and has established itself as a professional solution provider for submarine cable
system in the region.

Applicable standards
Submarine cable (<35KV) meets the requirements of ZTT enterprise standard Q/320623AP
27-2006 “rated voltage 1KV~35KV XLPE insulated submarine power cable”.

The rated voltage 110KV submarine cable complies with the enterprise standard
Q/320691AAG 01-2008 “rated voltage 110KV XLPE insulated submarine cable”.

Comparing with land power cable, except the mechanical performance, ZTT submarine
cable has the same electrical performance, which complies with IEC or ICEA. Optical
performance of submarine composite cable is same with that of submarine optic fiber cable.

Model and Descriptions

Model Description

S-YJA41
submarine power cable: copper conductor with water-blocking tape, XLPE insulation system, LAP*
ZS-YJAF41
sheath or separately LAP sheath, PE sheath, armor bedding, steel wire armor, out yarns serving.

ZS-YJQ41 Submarine power cable: copper conductor with water-blocking tape, XLPE insulation system, lead
ZS-YJQF41 sheath or separately lead sheath, PE sheath, armor bedding, steel wire armor, out yarns serving.

Submarine composite cable: copper conductor with water-blocking tape, XLPE insulation system,
ZS-YJA41+OFC LAP* sheath or separately LAP sheath, PE sheath, inserted optic fiber cable, armor bedding, steel
ZS-YJAF41+OFC wire armor, out yarns serving.

Submarine composite cable: copper conductor with water-blocking tape, XLPE insulation system,
ZS-YJQ41+OFC
lead sheath or separately lead sheath, PE sheath, inserted optic fiber cable, armor bedding, steel
ZS-YJQF41+OFC
wire armor, out yarns serving.

Remark: LAP* : laminated aluminium plastic tape

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 Model: ZS-YJQF41 + OFC
3 cores (copper) XLPE insulation,
Lead sheath,
Steel wire armor,
Yarns serving submarine cable.

HDPE Sheath Waterblocking copper conductor

Tape Conductor screen

Inner bedding XLPE insulation

Steel wire armouring Insulation screen

Outer serving Semiconductor waterblocking tape

Optical fiber cell Alloy lead sheath

Filler Anti-corrosive layer

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 Note: Below value is based on following condition:lead sheath, single circuit, conductor
operating temp. =90℃, ground temp. =25℃, ground thermal resistance =1.0km/w,
burying depth 1.5m, air temp. =45℃

Rated voltage: 8.7/10kV, 8.7/15kV (ZS-YJQF41, ZS-YJQF41+OFC)

Conductor Insulation Lead sheath Bedding Armoring steel Outer serving Approx.Cable Approx.Cable
Cross section HDPE thickness
diameter diamerter thickness thickness wire dia. thickness dia. weight.

mm2 mm mm mm mm mm mm mm mm kg/m
50 8.2 4.5 1.3 2.0 2.0 5.0 3.0 82 16.1
70 10.0 4.5 1.3 2.0 2.0 5.0 3.0 86 18.0
95 11.6 4.5 1.4 2.0 2.0 5.0 3.0 90 19.8
120 13.0 4.5 1.4 2.0 2.0 5.0 3.0 93 21.5
150 14.4 4.5 1.5 2.0 2.0 5.0 3.0 96 23.3
185 16.2 4.5 1.5 2.0 2.0 5.0 3.0 100 25.6
240 18.4 4.5 1.6 2.1 2.0 5.0 3.0 105 28.9
300 20.6 4.5 1.6 2.1 2.0 5.0 3.0 111 32.4
400 23.5 4.5 1.7 2.2 2.0 5.0 3.0 120 38.2

DC@20℃ AC@90℃ DC@20℃ Ampacity Short circuit Current,1s

Nominal cross Screen Cross
conductor conductor Screen Capacitance Inductance
section section
resistance resistance resistance Air Ground Cinductor Screen
2 2
mm mm Ω/km Ω/km Ω/km μF/km mH/km A A kA kA
50 94.3 0.387 0.494 2.27 0.213 0.438 194 193 7.2 2.3
70 101.7 0.268 0.342 2.10 0.242 0.412 840 235 10.0 2.5
95 117.0 0.193 0.246 1.83 0.267 0.393 288 278 13.6 2.9
120 123.2 0.153 0.196 1.74 0.289 0.379 328 314 17.2 3.0
150 139.0 0.124 0.159 1.54 0.311 0.367 369 348 21.5 3.4
185 147.5 0.0991 0.127 1.45 0.339 0.354 418 389 26.5 3.6
240 168.9 0.0754 0.0976 1.27 0.374 0.341 481 441 34.3 4.1
300 180.0 0.0601 0.0778 1.19 0.408 0.331 542 489 42.9 4.4
400 213.6 0.0470 0.0614 1.00 0.466 0.324 614 541 57.2 5.2

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Rated voltage: 12/20kV (ZS-YJQF41, ZS-YJQF41+OFC)
Conductor Insulation Lead sheath Bedding Armoring steel Outer serving Approx.Cable Approx.Cable
Cross section HDPE thickness
diameter diamerter thickness thickness wire dia. thickness dia. weight.

mm2 mm mm mm mm mm mm mm mm kg/m
50 8.2 5.5 1.4 2.0 2.0 5.0 3.0 87 17.6
70 10.0 5.5 1.4 2.0 2.0 5.0 3.0 91 19.4
95 11.6 5.5 1.5 2.0 2.0 5.0 3.0 94 21.4
120 13.0 5.5 1.5 2.0 2.0 5.0 3.0 97 23.1
150 14.4 5.5 1.5 2.0 2.0 5.0 3.0 101 25.0
185 16.2 5.5 1.6 2.0 2.0 5.0 3.0 105 27.4
240 18.4 5.5 1.6 2.1 2.0 5.0 3.0 110 30.8
300 20.6 5.5 1.7 2.1 2.0 5.0 3.0 110 34.3
400 23.5 5.5 1.8 2.2 2.0 5.0 3.0 125 40.2

DC@20℃ AC@90℃ DC@20℃ Ampacity Short circuit Current,1s

Nominal cross Screen Cross
conductor conductor Screen Capacitance Inductance
section section
resistance resistance resistance Air Ground Cinductor Screen

mm2 mm2 Ω/km Ω/km Ω/km μF/km mH/km A A kA kA

50 110.8 0.387 0.494 1.93 0.185 0.453 196 193 7.2 2.7
70 118.8 0.268 0.342 1.80 0.268 0.425 242 235 10.0 2.9
95 135.2 0.193 0.246 1.58 0.229 0.405 290 279 13.6 3.3
120 141.8 0.153 0.196 1.51 0.247 0.391 331 314 17.2 3.5
150 148.4 0.124 0.159 1.44 0.265 0.379 372 349 21.5 3.6
185 167.9 0.0991 0.127 1.27 0.289 0.367 421 389 26.5 4.1
240 178.9 0.0754 0.0976 1.20 0.317 0.352 485 441 34.3 4.4
300 202.4 0.0601 0.0778 1.06 0.345 0.341 545 488 42.9 4.9
400 238.1 0.0470 0.0614 0.90 0.392 0.333 616 540 57.2 5.8

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 Rated voltage: 18/30kV (ZS-YJQF41, ZS-YJQF41+OFC)
Conductor Insulation Lead sheath Bedding Armoring steel Outer serving Approx.Cable Approx.Cable
Cross section HDPE thickness
diameter diamerter thickness thickness wire dia. thickness dia. weight.

mm2 mm mm mm mm mm mm mm mm kg/m
50 8.2 8.0 1.5 2.0 2.0 5.0 3.0 98 21.6
70 10.0 8.0 1.6 2.0 2.0 5.0 3.0 102 23.5
95 11.6 8.0 1.6 2.1 2.0 5.0 3.0 106 25.7
120 13.0 8.0 1.6 2.1 2.0 5.0 3.0 109 27.6
150 14.4 8.0 1.7 2.1 2.0 5.0 3.0 113 29.6
185 16.2 8.0 1.7 2.2 2.0 5.0 3.0 117 32.0
240 18.4 8.0 1.8 2.2 2.0 5.0 3.0 122 35.6
300 20.6 8.0 1.9 2.2 2.0 5.0 3.0 127 39.4
400 23.5 8.0 1.9 2.3 2.0 5.0 3.0 137 45.6

DC@20℃ AC@90℃ DC@20℃ Ampacity Short circuit Current,1s

Nominal cross Screen Cross
conductor conductor Screen Capacitance Inductance
section section
resistance resistance resistance Air Ground Cinductor Screen

mm2 mm2 Ω/km Ω/km Ω/km μF/km mH/km A A kA kA

50 142.8 0.387 0.494 1.50 0.143 0.485 200 196 7.2 3.5
70 161.9 0.268 0.342 1.33 0.160 0.456 246 238 10.0 3.9
95 170.0 0.193 0.246 1.26 0.175 0.435 294 281 13.6 4.1
120 176.9 0.154 0.196 1.21 0.188 0.420 335 316 17.2 4.3
150 196.0 0.124 0.159 1.09 0.200 0.406 376 348 21.5 4.8
185 205.6 0.0991 0.127 1.04 0.217 0.392 423 388 26.5 5.0
240 230.7 0.0754 0.0976 0.93 0.236 0.377 488 439 34.3 5.6
300 257.3 0.0601 0.0778 0.83 0.256 0.363 547 485 42.9 6.3
400 281.7 0.0470 0.0614 0.76 0.289 0.355 619 537 57.2 6.9

Rated voltage: 26/35kV (ZS-YJQF41, ZS-YJQF41+OFC)

Conductor Insulation Lead sheath Bedding Armoring steel Outer serving Approx.Cable Approx.Cable
Cross section HDPE thickness
diameter diamerter thickness thickness wire dia. thickness dia. weight.

mm2 mm mm mm mm mm mm mm mm kg/m
50 8.2 10.5 1.7 2.1 2.0 5.0 3.0 110 226.1
70 10.0 10.5 1.7 2.1 2.0 5.0 3.0 114 28.3
95 11.6 10.5 1.8 2.2 2.0 5.0 3.0 118 30.4
120 13.0 10.5 1.8 2.2 2.0 5.0 3.0 121 32.4
150 14.4 10.5 1.8 2.2 2.0 5.0 3.0 124 34.5
185 16.2 10.5 1.9 2.3 2.0 5.0 3.0 129 37.1
240 18.4 10.5 1.9 2.3 2.0 5.0 3.0 134 41.0
300 20.6 10.5 2.0 2.4 2.0 5.0 3.0 139 44.9
400 23.5 10.5 2.1 2.4 2.0 5.0 3.0 149 51.5

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 DC@20℃ AC@90℃ DC@20℃ Ampacity Short circuit Current,1s
Nominal cross Screen Cross
conductor conductor Screen Capacitance Inductance
section section
resistance resistance resistance Air Ground Cinductor Screen
2 2
mm mm Ω/km Ω/km Ω/km μF/km mH/km A A kA kA
50 189.6 0.387 0.494 1.13 0.121 0.514 203 197 7.2 4.6
70 199.2 0.268 0.342 1.07 0.134 0.483 250 239 10.0 4.9
95 220.5 0.193 0.246 0.97 0.146 0.461 298 281 13.6 5.4
120 228.5 0.154 0.196 0.94 0.156 0.445 339 315 17.2 5.6
150 236.4 0.124 0.159 0.91 0.166 0.431 380 350 21.5 5.8
185 260.8 0.0991 0.127 0.82 0.178 0.415 428 388 26.5 6.4
240 274.0 0.0754 0.0976 0.78 0.193 0.399 493 440 34.3 6.7
300 302.8 0.0601 0.0778 0.71 0.209 0.385 551 484 42.9 7.4
400 345.7 0.0470 0.0614 0.62 0.234 0.374 623 537 57.2 8.4

Rated voltage: 48/66kV (ZS-YJQF41, ZS-YJQF41+OFC)

Conductor Insulation Lead sheath Bedding Armoring steel Outer serving Approx.Cable Approx.Cable
Cross section HDPE thickness
diameter diamerter thickness thickness wire dia. thickness dia. weight.

mm2 mm mm mm mm mm mm mm mm kg/m
70 10.0 13.0 2.0 2.2 2.0 6.0 3.0 130 34.4
95 11.6 13.0 2.0 2.2 2.0 6.0 3.0 134 36.3
120 13.0 13.0 2.1 2.2 2.0 6.0 3.0 137 38.7
150 14.4 13.0 2.1 2.3 2.0 6.0 3.0 140 40.9
185 16.2 13.0 2.1 2.3 2.0 6.0 3.0 145 43.9
240 18.4 13.0 2.2 2.3 2.0 6.0 3.0 150 47.1
300 20.6 13.0 2.3 2.4 2.0 6.0 3.0 155 51.4

DC@20℃ AC@90℃ DC@20℃ Ampacity Short circuit Current,1s

Nominal cross Screen Cross
conductor conductor Screen Capacitance Inductance
section section
resistance resistance resistance Air Ground Cinductor Screen
2 2
mm mm Ω/km Ω/km Ω/km μF/km mH/km A A kA kA
70 270.2 0.268 0.342 0.79 0.111 0.509 272 225 10.0 6.6
95 280.2 0.193 0.246 0.76 0.120 0.486 318 261 13.6 6.9
120 304.1 0.153 0.196 0.70 0.127 0.469 354 289 17.2 7.5
150 313.4 0.124 0.159 0.68 0.135 0.455 389 316 21.5 7.7
185 341.4 0.0991 0.127 0.63 0.144 0.438 429 346 26.5 8.4
240 356.9 0.0754 0.0976 0.60 0.156 0.420 481 386 34.3 8.8
300 389.5 0.0601 0.0778 0.55 0.167 0.406 525 419 42.9 9.6

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 Model: ZS-YJAF41 + OFC
3 cores (copper) XLPE insulation,
Laminated aluminium plastic tape,
Steel wire armor,
Yarns serving submarine cable.

HDPE sheach Waterblocking copper conductor

Tape Conductor screen

Inner bedding XLPE insulation

Steel wire armouring Insulation screen

Outer serving Semiconductor waterblocking tape

Optical fiber cell Copper tape screen

Filler LAP tape

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Note: below value is based on following condition: copper
tape screen, single circuit, conductor operating temp. =90℃,
ground temp. =25℃, ground thermal resistance =1.0K.m/w,
burying depth 1.5m, air temp. =45℃.

Rated voltage: 8.7/10kV, 8.7/15kV (ZS-YJAF41, ZS-YJAF41+OFC)

Conductor Insulation Lead sheath Bedding Armoring steel Outer serving Approx.Cable Approx.Cable
Cross section HDPE thickness
diameter diamerter thickness thickness wire dia. thickness dia. weight.

mm2 mm mm mm mm mm mm mm mm kg/m
50 8.2 4.5 0.3 2.3 2.0 5.0 3.0 80 12.9
70 10.0 4.5 0.3 2.3 2.0 5.0 3.0 84 14.4
95 11.6 4.5 0.3 2.4 2.0 5.0 3.0 88 15.9
120 13.0 4.5 0.3 2.4 2.0 5.0 3.0 91 17.3
150 14.4 4.5 0.3 2.4 2.0 5.0 3.0 94 18.7
185 16.2 4.5 0.3 2.5 2.0 5.0 3.0 98 20.6
240 18.4 4.5 0.3 2.5 2.0 5.0 3.0 103 23.3
300 20.6 4.5 0.3 2.5 2.0 5.0 3.0 108 26.1
400 23.5 4.5 0.3 2.6 2.0 5.0 3.0 117 30.7

DC@20℃ AC@90℃ DC@20℃ Ampacity Short circuit Current,1s

Nominal cross Screen Cross
conductor conductor Screen Capacitance Inductance
section section
resistance resistance resistance Air Ground Cinductor Screen
2 2
mm mm Ω/km Ω/km Ω/km μF/km mH/km A A kA kA
50 8.1 0.387 0.494 2.13 0.213 0.433 184 187 7.2 1.1
70 8.8 0.268 0.342 1.96 0.242 0.406 229 229 10.0 1.2
95 9.4 0.193 0.246 1.84 0.267 0.387 275 272 13.6 1.3
120 9.9 0.153 0.196 1.74 0.289 0.374 315 307 17.2 1.3
150 10.5 0.124 0.159 1.65 0.311 0.362 355 343 21.5 1.4
185 11.1 0.0991 0.127 1.55 0.339 0.349 395 376 26.5 1.5
240 12.0 0.0754 0.0976 1.44 0.374 0.336 459 431 34.3 1.6
300 12.8 0.0601 0.0778 1.35 0.408 0.325 518 482 42.9 1.7
400 14.3 0.0470 0.0614 1.20 0.466 0.318 623 554 57.2 1.9

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 Rated voltage: 12/20kV (ZS-YJAF41, ZS-YJAF41+OFC)
Conductor Insulation Lead sheath Bedding Armoring steel Outer serving Approx.Cable Approx.Cable
Cross section HDPE thickness
diameter diamerter thickness thickness wire dia. thickness dia. weight.

mm2 mm mm mm mm mm mm mm mm kg/m
50 8.2 5.5 0.3 2.3 2.0 5.0 3.0 85 14.0
70 10.0 5.5 0.3 2.4 2.0 5.0 3.0 89 15.4
95 11.6 5.5 0.3 2.4 2.0 5.0 3.0 92 17.1
120 13.0 5.5 0.3 2.4 2.0 5.0 3.0 95 18.3
150 14.4 5.5 0.3 2.5 2.0 5.0 3.0 99 19.8
185 16.2 5.5 0.3 2.5 2.0 5.0 3.0 103 21.8
240 18.4 5.5 0.3 2.5 2.0 5.0 3.0 108 24.6
300 20.6 5.5 0.3 2.6 2.0 5.0 3.0 112 27.4
400 23.5 5.5 0.3 2.6 2.0 5.0 3.0 122 32.0

DC@20℃ AC@90℃ DC@20℃ Ampacity Short circuit Current,1s

Nominal cross Screen Cross
conductor conductor Screen Capacitance Inductance
section section
resistance resistance resistance Air Ground Cinductor Screen
2 2
mm mm Ω/km Ω/km Ω/km μF/km mH/km A A kA kA
50 8.9 0.387 0.494 1.94 0.185 0.447 187 188 7.2 1.2
70 9.5 0.268 0.342 1.81 0.208 0.416 231 229 10.0 1.3
95 10.1 0.193 0.246 1.70 0.229 0.400 878 273 13.6 1.4
120 10.7 0.153 0.196 1.61 0.247 0.386 318 309 17.2 1.4
150 11.2 0.124 0.159 1.54 0.265 0.373 357 344 21.5 1.5
185 11.9 0.0991 0.127 1.45 0.289 0.360 399 378 26.5 1.6
240 12.7 0.0754 0.0976 1.36 0.317 0.346 463 431 34.3 1.7
300 13.5 0.0601 0.0778 1.27 0.345 0.334 520 482 42.9 1.8
400 15.1 0.0470 0.0614 1.14 0.392 0.327 617 554 57.2 2.0

Rated voltage: 18/30kV (ZS-YJAF41, ZS-YJAF41+OFC)

Conductor Insulation Lead sheath Bedding Armoring steel Outer serving Approx.Cable Approx.Cable
Cross section HDPE thickness
diameter diamerter thickness thickness wire dia. thickness dia. weight.

mm2 mm mm mm mm mm mm mm mm kg/m
50 8.2 8.0 0.3 2.4 2.0 5.0 3.0 96 16.8
70 10.0 8.0 0.3 2.5 2.0 5.0 3.0 100 18.3
95 11.6 8.0 0.3 2.5 2.0 5.0 3.0 104 19.9
120 13.0 8.0 0.3 2.5 2.0 5.0 3.0 107 21.3
150 14.4 8.0 0.3 2.6 2.0 5.0 3.0 110 22.9
185 16.2 8.0 0.3 2.6 2.0 5.0 3.0 114 25.0
240 18.4 8.0 0.3 2.6 2.0 5.0 3.0 119 27.7
300 20.6 8.0 0.3 2.7 2.0 5.0 3.0 124 30.6
400 23.5 8.0 0.3 2.7 2.0 5.0 3.0 133 35.6

18 www.zttcable.com
 DC@20℃ AC@90℃ DC@20℃ Ampacity Short circuit Current,1s
Nominal cross Screen Cross
conductor conductor Screen Capacitance Inductance
section section
resistance resistance resistance Air Ground Cinductor Screen
2 2
mm mm Ω/km Ω/km Ω/km μF/km mH/km A A kA kA
50 10.8 0.387 0.494 1.60 0.143 0.479 191 190 7.2 1.4
70 11.4 0.268 0.342 1.51 0.160 0.450 236 231 10.0 1.5
95 12.0 0.193 0.246 1.43 0.175 0.429 275 275 13.6 1.6
120 12.6 0.153 0.196 1.37 0.188 0.414 310 310 17.2 1.7
150 13.1 0.124 0.159 1.32 0.200 0.400 345 345 21.5 1.8
185 13.8 0.0991 0.127 1.25 0.217 0.386 379 379 26.5 1.9
240 14.6 0.0754 0.0976 1.18 0.236 0.371 432 432 34.3 2.0
300 15.4 0.0601 0.0778 1.12 0.256 0.351 482 482 42.9 2.1
400 17.0 0.0470 0.0614 1.02 0.289 0.348 556 572 57.2 2.3

Rated voltage: 26/35kV (ZS-YJAF41, ZS-YJAF41+OFC)

Conductor Insulation Lead sheath Bedding Armoring steel Outer serving Approx.Cable Approx.Cable
Cross section HDPE thickness
diameter diamerter thickness thickness wire dia. thickness dia. weight.

mm2 mm mm mm mm mm mm mm mm kg/m
50 8.2 10.5 0.3 2.5 2.0 5.0 3.0 107 19.7
70 10.0 10.5 0.3 2.6 2.0 5.0 3.0 111 21.4
95 11.6 10.5 0.3 2.6 2.0 5.0 3.0 115 23.0
120 13.0 10.5 0.3 2.6 2.0 5.0 3.0 118 24.6
150 14.4 10.5 0.3 2.7 2.0 5.0 3.0 121 26.2
185 16.2 10.5 0.3 2.7 2.0 5.0 3.0 125 28.2
240 18.4 10.5 0.3 2.7 2.0 5.0 3.0 130 31.1
300 20.6 10.5 0.3 2.8 2.0 5.0 3.0 135 34.2
400 23.5 10.5 0.3 2.8 2.0 5.0 3.0 144 39.3

DC@20℃ AC@90℃ DC@20℃ Ampacity Short circuit Current,1s

Nominal cross Screen Cross
conductor conductor Screen Capacitance Inductance
section section
resistance resistance resistance Air Ground Cinductor Screen
2 2
mm mm Ω/km Ω/km Ω/km μF/km mH/km A A kA kA
50 12.6 0.387 0.494 1.36 0.121 0.507 195 192 7.2 1.7
70 13.3 0.268 0.342 1.29 0.134 0.476 240 233 10.0 1.8
95 13.9 0.193 0.246 1.24 0.146 0.454 289 277 13.6 1.9
120 14.4 0.153 0.196 1.19 0.156 0.438 330 313 17.2 1.9
150 15.0 0.124 0.159 1.15 0.166 0.424 370 349 21.5 2.0
185 15.7 0.0991 0.127 1.10 0.178 0.408 413 383 26.5 2.1
240 16.5 0.0754 0.0976 1.05 0.193 0.392 477 436 34.3 2.2
300 17.3 0.0601 0.0778 1.00 0.209 0.378 536 482 42.9 2.3
400 18.9 0.0470 0.0614 0.91 0.234 0.367 635 561 57.2 2.5

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 Model: ZS-YJQ41 + OFC
Single core (copper) XLPE insulation,
Lead sheath,
Steel wire armor,
Yarn serving submarine cable.

Alloy lead sheath Waterblocking copper conductor

Anti-corrosion layer Conductor screen

PE sheath XLPE insulation

Inner bedding Insulation screen

Steel wire armouring Semiconductor waterblocking tape

Outer serving Optical unit

20 www.zttcable.com
Note: below value is based on following condition: copper
tape screen, single circuit, conductor operating temp. =90℃,
ground temp. =25℃, ground thermal resistance =1.0K.m/w,
burying depth 1.5m, air temp. =45℃.

Rated voltage: 64/110kV (ZS-YJQ41, ZS-YJQ41+OFC)

Conductor Insulation Lead sheath Bedding Armoring steel Outer serving Approx.Cable Approx.Cable
Cross section HDPE thickness
diameter diamerter thickness thickness wire dia. thickness dia. weight.

mm2 mm mm mm mm mm mm mm mm kg/m
240 18.4 19.0 4.0 4.0 2.0 5.0 3.0 106 27.4
300 20.6 18.5 4.0 4.0 2.0 5.0 3.0 107 28.3
400 23.5 17.5 4.0 4.0 2.0 5.0 3.0 108 29.4
500 26.6 17.0 4.0 4.0 2.0 5.0 3.0 110 30.9
630 30.0 16.5 4.0 4.5 2.0 5.0 3.0 114 33.3
800 34.0 16.0 4.0 4.5 2.0 5.0 3.0 117 36.1
1000 38.2 16.0 4.0 4.5 2.0 5.0 3.0 122 39.0

DC@20℃ AC@90℃ DC@20℃ Ampacity Short circuit Current,1s

Nominal cross Screen Cross
conductor conductor Screen Capacitance Inductance
section section
resistance resistance resistance Air Ground Cinductor Screen
2 2
mm mm Ω/km Ω/km Ω/km μF/km mH/km A A kA kA
240 847.2 0.0754 0.0976 0.31 0.125 1.768 573 587 34.8 22.4
300 860.1 0.0601 0.0777 0.30 0.135 1.748 635 641 43.4 22.5
400 875.3 0.0470 0.0613 0.30 0.152 1.719 707 698 57.8 22.5
500 898.2 0.0366 0.0484 0.29 0.167 1.696 778 752 72.2 22.8
630 930.4 0.0283 0.0382 0.28 0.184 1.672 853 807 90.9 23.3
800 975.3 0.0221 0.0309 0.27 0.207 1.647 921 852 115.3 24.2
1000 1026.1 0.0176 0.0224 0.25 0.224 1.624 981 888 144.0 25.3

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 Submarine cable Design software

Electrical finite element method software:Based on the. Static current field, as

well as Poisson electric field coupling with thermal field should be analyzed by a
decoupling method. Analysis and calculation insulation electric stress distribution
and current rating,Design insulation structure.

Cable structure and mechanical design software: It can be used for submarine cable
structure analysis and mechanical properties calculation to verify the accuracy of
cable design.

Marine stability analysis software:It can be used for analysing the cable stability
conditions when cable is laied directly on the seabed or buried through analysis of
the interaction of ocean wave and current, submarine cable and the seabed soil.

22 www.zttcable.com
Marine stability analysis software: Can be used for the analysis of submarine
cable which laied on the seabed or buried condition. Can be used for analysis
of submarine cable stability, free-span, theoritical calculation of fatigue through
analysing of the interaction among oncean wave, submarine cable itself and
contacted soil.

Finite element analysis & design software of Hang-Off stress point: Can be used
for the analysis of Hang-Off of the submarine cable. Providing theoretical basis for
Hang-Off design through analysing the tension between Hang-Off and submarine
cable under various conditions during operation.

Finite element analysis & design software for Hang-Off stress point

www.zttcable.com 23
 Flexible DC Power transmission with cross-linked polyethylene insulated cable

Production Functions
XLPE insulation flexible HVDC submarine composite P/FO cables as VSC system
line power transmission carrier ,it is mainly suitable for Industrial power generation
demonstration project, Offshore wind power generation, Different AC system grid
interconnected, Submarine power transmission between island and mainland,
Increase the power transmission capacity of coastal city, Large oil platform on the
sea.

VSC Topology Drawing

Flexible DC submarine
VSC power cable VSC

AC grid AC grid
Termination Factory splice Termination

Main Technological Features

The system can change the current direction of transmission, which does not require polarity
reversal
The cables are operated in bipolar mode, one cable with positive polarity and one cable with
negative polarity.
XLPE insulation submarine cables have high working temperature and superior electrical
machinery performance.
Distance of transmission can be thousands of kilometers, capacity of transmission can be
thousands of megawatts.
Environmentally friendly, risk of oil spill, as in paper-oil-insulated cables, is eliminated.

24 www.zttcable.com
Products Standards
Recommendations for mechanical tests on submarine cables
Recommendations for testing of long AC submarine cables with extruded insulation
for system voltage above 30 (36) to 500 (550) kV
Recommendations for testing DC extruded cable systems for power transmission at
a rated voltage up to 500 kV
Power cables with extruded insulation and their accessories for rated voltages
above 150 kV (Um= 170 kV) up to 500 kV (Um = 550 kV) - Test methods and
requirements
The design of submarine power cable is not strictly in accordance with international
standards. ZTT’s products are all designed meet the project need with consideration
of the routing information and operating performance including electrical, thermal,
optical, mechanical and water-blocking performance requirements. For special
project, ZTT shall have the cables Type test verification, to ensure the long-term
operational reliability of the cable

Name and Environment

Name Applicable environment

Copper conductor XLPE insulation lead sheath thick The cable is installed in the submarine environment
steel-wire armored submarine optic fiber compodite for power and signal transmission and can withstand
power cable. the substantial pulling force.

Copper conductor XLPE insulation lead sheath Used in deep water,can aied directly on the seabed
double steel-wire(flat steel wires)armored submarine with the performance of impact-resisting and high
power cable. tensile strength withstanding.

Copper or aluminum conductor XLPE insulation Used in the tunnel or buried in the ground and it is
corrugated aluminum sheath(lead sheath) applicable in the damp environment withstanding a
PE jacket power cable. certain tension.

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 Product Structure Drawing

Conductor

Conductor screen

XLPE insulation

Insulation screen

Semi-cond cushion water blocking tape

Corrugated aluminium sheath

Bitumen

PE sheath

Land Power Cable

Waterblocking copper conductor

Conductor screen
XLPE insulation
Insulation screen
Semi-cond waterblocking tape
Alloy lead sheah
Anti-corrosion bitumen
PE sheath
PE filler
Optical fiber unit
PP inner bedding
Double steel wire armouring
PP outer serving

Submarine Optic Fiber Compodite Power

Cable

Waterblocking copper conductor

Conductor screen
XLPE insulation
Insulation screen
Semi-cond waterblocking tape
Alloy lead sheah
Anti-corrosion bitumen
PE sheath
PP inner bedding
Double steel wire armouring
PP outer serving

High strength double armored submarine

power cable

26 www.zttcable.com
 Waterblocking copper conductor
Tape

Inner bedding Conductor screen

XLPE insulation
Steel wire armouring
Insulation screen
Outer serving
Semiconductor waterblocking tape

Optical fiber unit

Alloy lead sheath

Filler Anti-corrosive
layer

XLPE insulated separately lead sheathed thick steel wire armored fiber
covering submarine optical fiber composite power cable

HDPE sheath Waterblocking copper

conductor
Tape
Conductor screen
Inner bedding
XLPE insulation
Steel wire armouring
Insulation screen

Outer serving
Semiconductor waterblocking tape

Optcal fiber unit Copper tape screen

Filler LAP tape

XLPE insulated separately LAP sheathed thick steel wire armored fiber
covering submarine optical fiber composite power cable

Waterblocking copper
conductor
Conductor wrapping layer

Conductor screen
Center supported
XLPE insulation
Optical fiber unit
Insulation screen
Inner bedding
LAP tape
Steel wire armouring
Alloy lead sheath
Anti-corrosion layer
Semiconductor waterblocking
Outer serving tape
Tape

Filler

XLPE insulated lead sheath thick steel armored fiber covering

submarine optical fiber composite power cable

www.zttcable.com 27
 Power Transmission Capacity

Note: Submarine cable environment design conditions, earth tem.=25℃, earth thermal resistivity 1.2 k.m/W
buried depth 2m.
Land cable environment design conditions, earth tem.=30℃, earth thermal resistivity 2.0 k.m/W buried depth
0.5m.

28 www.zttcable.com
Technical requirement
ZTT's submarine cable laid under sea is used for power and information
transmission between platforms, island and mainland. It's of large capacity, long
length and high reliability for information and power transmission. It can meet the
special mechanical performance requirements of under sea conditions.

Technical standards
Recommendations for mechanical tests on submarine cables
Submarine cable (the rated voltage below 35kV) meets the reqirements of the
enterprise standard Q/320623AP 27-2006 “Rated Voltage 1KV-35KV XLPE
Insulated Submarine Power Cable”.
The rated voltage 110kV of submarine cable accords with the enterprise standard
Q/320691AAG 01-2008 “Rated Voltage 110KV XLPE Insulated Submarine Cable”.
The rated voltage 220kV of submarine cable accords with the enterprise standard
Q/320691AAG 04-2010 “Rated Voltage 220KV XLPE Insulated Submarine Cable”.

Name and Environment

Name Applicable environment

Copper conductor XLPE insulated LAP sheathed or

Used in seabed, platform and underwater,
separately LAP sheathed thick steel-wire armored
it is able to bear external mechanical force
fiber covering submarine optical fiber composite
and much tension.
power cable

Copper conductor XLPE insulated lead sheathed or

separately lead sheathed thick steel-wire armored Used in seabed, it is able to bear external
fiber covering submarine optical fiber composite mechanical force and much tension.
power cable

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 Cable Accessory

Cable accessory
The deployment of submarine cable is a highly professional piece of engineering work.
Installation vessel outfitted with special equipment. Professional desktop design and
supervision service at site is vital to the operation. ZTT not only produces submarine
cable but also supply related accessory, including J-tube seal, cable clamp, pulling head
and joint box etc..

Submarine joint box is necessary for submarine cable project. ZTT possess its own
intellectual property for submarine joint box. The product series includes direct joint box,
branch joint box, joint box for submarine composite cable, flexible joint, onshore joint box,
etc..

Joint box for shallow sea application / model: GJHQ

Suitable for cable connection and repair in
shallow sea condition, less than 200m water
depth.
High mechanical strength, good sealing and
strong anti-corrosion.
Tin alloy cover has good performance of
anticorrosion.
Cone-shape locking of steel wire ensures good
recovery of cable tensile strength.

Joint box for deep sea application / model: GJSH

Suitable for cable connection and repair in deep
sea condition, less than 8000m water depth.
Guarantee the power circuit of deep sea SOFC,
and the splicing between repeater and cable.
Adopt overall injection and molding art for the
splicing closure.
Use special gimbal to adjust the bending radius.
Good performance of water sealing and electrical
insulation under 8000m water depth.
Withstand the strength above 90% UTS of deep
sea SOFC.

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Beach Joint box / model: GPJ-JA48
Use to connect SOFC to land FO cable after exit from the manhole.
High mechanical strength, good sealing and strong anti-corrosion
Stainless steel cover has a good performance of anti-corrosion
Cone-shape locking of steel wire ensures good recovery of cable tensile strength

Joint box for submarine composite cable / model: GDFH-JT

Use for cable connection and repair of submarine composite cable
High mechanical strength, good sealing and strong anti-corrosion
Stainless steel cover has a good performance of anti-corrosion
Cone-shape locking of steel wire ensures good recovery of cable tensile strength
Half structure of out cover

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 Quality and Quality Assurance

Quality and quality assurance has always been and will be the key element of ZTT's
objective. ZTT established its own high technical laboratory to perform the necessary
product tests before shipping. Having certified ISO9001 and ISO14001, every cable
product carries a quality stamp label and certificate.

Health, Safety & Environment

HSE is ensured by a safety management system. All equipment meets National

Standards and are subjected to a strict maintenance program and periodic calibration by
qualified personnel or institutes. A constant reduction of raw material and energy as well
as product improvement also forms part of ZTT environment policy.

32 www.zttcable.com
Standard and Recommendations

Although submarine cables are

usually produced according to specific
project requirement, ZTT embraces
international scientific consortium
standards like IEC, ITU, CIGRE etc...

Research and Development

ZTT's R&D engineering experts are grouped from the Pioneers of Engineers for
Submarine Cable System in China. To date, they still collaborate closely with specialists
from leading laboratories, research institutes, professors from famous universities. With
constantly upgrading in State-of-the-Art equipment and technology, they created and
received many First in invention prize award for related products in the industry.

www.zttcable.com 33
 ZTT is a leading and global manufacturer of cable systems, which provides
package solutions for telecommunication and power applications around
the world. With its rich heritage of highly advanced R&D results, ZTT owns
the cutting-edge technology within the industry.

ZTT was established in 1992 and became a listed company in 2002. Up to

now, ZTT has developed to be a Group Company with 26 subsidiaries in
China. Our products are widely used in telecommunication industry, power
transmission industry, mining cable industry, marine and submarine cable
industry, railway industry, cable manufacturing and so on.

ZTT has always committed to be market-oriented, meeting various

demands of our customers and providing economical & reliable solutions.
With innovative product design, ZTT can also guarantee the high-end
engineering capabilities and life cycle maintenance services.

Add:No.5 Zhongtian Road, Nantong Economic and Technological Development Zone, Nantong, Jiangsu, China P.C.:226009
Tel:86-513-83599774 Fax:86-513-83599722
Http://www.zttcable.com E-mail:international@zttcable.com
2013.8